Method of on-press developing thermosensitive lithographic printing plate

a technology of thermosensitive lithography and printing plate, applied in the field of lithographic printing, can solve the problems of cumbersome methods and laborious

Inactive Publication Date: 2010-05-04
TENG GARY GANGHUI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While capable of providing plate with superior lithographic quality, such a method is cumbersome and labor intensive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0057]An electrochemically grained, anodized and polyvinylphosphonic acid treated aluminum substrate was first coated with a 0.2% (by weight) aqueous solution of polyvinyl alcohol (Airvol 540, from Air Products) with a #6 Meyer rod, followed by drying in an oven at 90° C. for 2 min. The polyvinyl alcohol coated substrate was further coated with a thermosensitive layer formulation PS-1 with a #8 Meyer rod, followed by drying in an oven at 90° C. for 2 min.

[0058]

PS-1ComponentWeight (g)Neocryl B-728 (Polymer from Zeneca)2.50Ebecryl 220 (Acrylate monomer from UCB Chemicals)5.99Pluronic L43 (Nonionic surfactant from BASF)0.40(4-(2-Hydroxytetradecyl-oxy)phenyl)phenyliodonium1.00hexafluorophosphatePINA KF-1151 (Infrared absorbing polymethine dye from0.10Allied Signal)2-Butanone90.00

[0059]The thermosensitive layer coated plate was further coated with a water-soluble overcoat OC-1 using a #6 Meyer rod, followed by hot air blow drying and baking in an oven at 90° C. for 2 min.

[0060]

OC-1Weight...

example 2

[0062]An electrochemically grained, anodized and silicate treated aluminum sheet was coated with thermosensitive layer formulation PS-2 using a #6 Meyer rod, followed by drying in an oven at 90° C. for 2 min.

[0063]

PS-2ComponentWeight ratiosNeocryl B-728 (Polymer from Zeneca)2.73Sartomer SR-399 (Acrylic monomer from Sartomer)6.52Pluronic L43 (Nonionic surfactant from BASF)0.562,4-Bis(trichloromethyl)-6-[(4-ethoxyethylenoxy)-phen-1.001-yl]-s-triazineADS-830AT (Infrared absorbing cyanine dye from0.10American Dye Source)Acetone90.0

[0064]The thermosensitive layer coated plate was further coated with a water-soluble overcoat OC-2 using a #6 Meyer rod, followed by drying in an oven at 100° C. for 2 min.

[0065]

OC-2WeightComponentratiosAirvol 205 (Polyvinyl alcohol from Air Products)5.00Zonyl FSO (Perfluorinated surfactant from0.02DuPont)Water95.00

[0066]The coated plate was exposed with an infrared laser plate imager equipped with laser diodes emitting at about 830 nm (Trendsetter from Creo) ...

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Abstract

A method of on-press developing a thermosensitive lithographic printing plate with ink and / or fountain solution is described. The lithographic plate comprises on a substrate a thermosensitive layer soluble or dispersible in ink and / or fountain solution and capable of hardening upon exposure to an infrared radiation. The printing plate can be a pre-coated plate in the form of sheet or web, or can be prepared on press by coating a thermosensitive layer onto a substrate that is a sheet material or a seamless sleeve mounted on a plate cylinder or is the surface of a plate cylinder of the lithographic press.

Description

RELATED PATENT APPLICATIONS[0001]This application is a continuation-in-part application of U.S. patent application Ser. No. 11 / 356,911 filed Feb. 18, 2006; and U.S. patent application Ser. No. 11 / 057,663 filed Feb. 14, 2005.FIELD OF THE INVENTION[0002]This invention relates to lithographic printing. More particularly, it relates to lithographic printing plate having on a substrate a thermosensitive layer capable of hardening upon exposure to an infrared laser and on-press developable with ink and / or fountain solution.BACKGROUND OF THE INVENTION[0003]Lithographic printing plate (after process) generally consists of ink-receptive areas (image areas) and ink-repelling areas (non-image areas); the image areas and the non-image areas are substantially on the same plane. During printing operation, ink is preferentially received in the image areas, not in the non-image areas, and then transferred, usually through a printing blanket, to the surface of a material upon which the image is to b...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): G03F7/00B41N1/00G03C5/18
CPCB41C1/1008B41N3/08G03F7/033G03F7/32B41C1/1016B41C2210/24B41C2201/14B41C2210/04B41C2210/08B41C2210/22B41C2201/02
InventorTENG, GARY GANGHUI
OwnerTENG GARY GANGHUI